package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;

import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "LoginFilter",urlPatterns = {"/*"})
public class LoginFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws ServletException, IOException {
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;
        //获取本次请求的URI
        String requestURI = request.getRequestURI();
        //定义不需要处理的请求路径
        String[] urls=new String[] {
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "img/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        //判断此次请求是否需要处理
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                //不需要处理，则直接放行
                filterChain.doFilter(request,response);
                return;
            }
        }
        //判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee") != null) {

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }
        if (request.getSession().getAttribute("user") != null) {

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response); //放行
            //回来的代码，需要释放threadlocal中存储的
            
            return;
        }
        //如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }
}
